From the CBA
Section 2. Signing With Other Clubs: Any player under contract to a Club as a practice squad player shall be completely free to negotiate and sign a Player Contract with any Club at any time during the League Year, to serve as a player on any Club’s Active or Inactive List, and any Club is completely free to negotiate and sign such a Player Contract with such player, without penalty or restriction,
* If a player on the Practice Squad of one club (Club A) signs an NFL Player Contract with another club (Club B),
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(1) the player shall receive three weeks salary of his NFL Player Contract at the 53-player Active/Inactive List minimum even if he is terminated by Club B prior to earning that amount, and (2) Club B is required to count the player on its 53-player Active/Inactive List for three games (a bye week counts as a game) even if he is terminated or assigned via waivers to another club or is signed as a free agent to another club’s 53-player roster or another club’s Practice Squad prior to that time.