# Conditional Permissions

+ A copyleft license grants copyright permissions, conditionally.

+ Think of the phrase: “provided that”

+ “provided that”: appears (in some form) only

+ 4 times in GPLv2

+ 9 times in GPLv3.

# Compare To Proprietary Licenses

+ Yes, the GPL has its requirements.

+ But *none* of these activities are ever permitted under proprietary

  licenses.

+ If you don't like what the GPL requires you to do, then just tell your

  client to use the proprietary software instead.

+ That way, they know the answer to every question is “no&;rdquo,

+ rather than: “yes, but only as long as you …”