how to remotely check a username / password from within a plugin

Its nonsensical to lock activation, unless the functional part of your code remains on your site. You essentially can make a service that you hide behind a login or apikey (like akismet) which may or may not make sense for your plugin.

Calling home for permission to activate is a terrible idea, because idealistically, it’s a violation of the GPL (won’t earn you any fans or loyalty), and pragmatically, the client can easily change the code to not require the permission (won’t earn you any money either).

You could deny auto-updates and support behind a support contract, but that’s different isn’t it? In that case you cache the login info into an option and transmit that back you your server each time it requests the update zip. Your server checks the validity of the info before sending the update archive.

Related Posts:

  1. How to show my wordpress admin username & password?
  2. forgot password
  3. How to change user password with wp-cli?
  4. wordpress redirect after password reset
  5. Loosen/disable password policy
  6. Password Protect Custom Page
  7. Password protecting a page
  8. How to save Admin FTP password
  9. How can I change the default wordpress password hashing system to something custom?
  10. If I change the salt keys in my wp-config will all passwords break?
  11. Conditional to test if post has password protection enabled
  12. Bypass password protected posts via GET variable
  13. Check the password of a user
  14. How to add Wp_error using lostpassword_post hook when validating custom field?
  15. Create a USERNAME and PASSWORD protected WordPress page
  16. Why do generated passwords start/end with spaces?
  17. Duplicate hash method for password in .NET
  18. Hide password protected posts
  19. Safe to store SMTP password in wp-config.php?
  20. Access code/password only restricts page access, no user registration..?
  21. PasswordHash not found in namespace
  22. Force all users in MU to change their passwords
  23. Reseting admin password through PHPMyadmin fails
  24. Check Password Reset Key Not Woking
  25. Reset password – set minimum length for new password
  26. How to shorten length of auto generated password sent during registration?
  27. Forgot password not working
  28. wp_hash_password unexpected behaviour
  29. Password reset message – change the network_home_url( ‘/’ )
  30. Redirect a password protected page?
  31. Lost password link is redirecting to /shop/my-account/lost-password/
  32. WordPress: force users to change password on first login
  33. Can’t login to wordpress despite changing password to something known directly in MySQL or using “Password Reset by Email” feature
  34. Change default recovery link expiration time
  35. Lost password link redirects to my-account/lost-password/,how to fix it back to default lost password
  36. Password protect custom template
  37. Set content type to HTML for lost password email only
  38. Custom password generator for users
  39. Where is the reset password key stored/generated?
  40. Password protecting template, secured content not showing if even password is right
  41. How validate usernames/passwords against WP’s database?
  42. Make post password required to publish
  43. WordPress reset password returns invalid key
  44. Add error message on password protected pages
  45. User password field is empty
  46. Password reset bug? – “Sorry, that key does not appear to be valid”
  47. How to set minimum length and error message for password recovery?
  48. Why is resetting the WordPress Users password not working?
  49. Get plain password on register
  50. post_password_required() not recognizing cookie set with correct password
  51. How Authentication in wordpress works? wp_authenticate_username_password()
  52. Password protect the site (without htaccess or membership)
  53. Password Protected page not asking for a password
  54. I would like to password protect my entire WordPress site (ip validated), except for one page
  55. Password protection for page template
  56. Private page protected with username and password
  57. Custom login form for front-end user as well as admin
  58. Password changed [duplicate]
  59. Enable Update button only when password is shown strong
  60. How to get user password before being encrypted outside the wordpress core once add a new user from dashboard?
  61. Adding parameters to password reset key
  62. wp_hash_password create a different hash everytime
  63. Custom password form allows unlock two posts with the same password
  64. How to change password
  65. Generating the password reset link automatically
  66. Password protect pages – allow more than one password
  67. password recovery key is invalid on custom reset
  68. Like to store multiple passwords in db table wp_posts field post_password?
  69. Password Protected Post is invisible until you login
  70. Send password to user instead of reset password link
  71. Protect Passwords in wp_users with stronger protection than MD5
  72. Custom form for password protected page
  73. How secure is a wp-config file?
  74. How to check user’s password?
  75. How to Remove or Deactivate “Application Passwords” in WordPress
  76. What’s the algorithm to verify user password?
  77. How to change “Reset Password” text on submit button
  78. Customize retrieve password message
  79. Is it possible to rebuild the website while not accesseing the original database?
  80. How to recover password from a user
  81. resend user login & password with custom button
  82. WordPress admin creation through phpmyadmin not working
  83. Why does hashing a password result in different hashes, each time?
  84. Can’t alter $lostpassword_url
  85. current user’s password check
  86. WordPress not logged in locally with correct username and password
  87. How to initiate password reset flow by code
  88. Change password fields
  89. lostpassword_redirect filter is not used
  90. How to read third party cookie to access password protected pages
  91. Ask logged in user to re-enter password to access page “x”
  92. Password Protect or IP to access under development WordPress site otherwise shown a placeholder page
  93. Password protected sites
  94. Password-protected page redirecting to frontpage when I enter the password
  95. 2 accounts under same email preventing me from loging in
  96. How would I create a Password Protected Page with Content on it?
  97. Site only for users authenticated by different PHP application
  98. wordpress custom password change problem
  99. Allow all reset password links within the past 24 hours to be valid and accepted
  100. WooCommerce Lost Password reset goes to 404
Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)