Unrestricted free agent (UFA): Any player with four or more accrued seasons and an expired contract; free to negotiate and sign with any team.
Restricted free agent (RFA): A player with three accrued seasons and an expired contract. RFAs are free to negotiate and sign with any team, but their original team can offer them one of various qualifying offers ("tenders") that come with the right of first refusal and/or draft-pick compensation. If the tender is withdrawn by a team, the RFA becomes an unrestricted free agent.
Exclusive rights free agent (ERFA): Any player with fewer than three accrued seasons and an expired contract. If his original team offers him a one-year contract at the league minimum (based on his credited seasons), the player cannot negotiate with other teams.
Non-exclusive franchise tag: A player who receives the non-exclusive franchise tag is free to negotiate with other teams.
Renegotiations: Rookie contracts for drafted players can't be renegotiated or altered in any way until after the last regular-season game of the third contracted year. Undrafted rookies must wait until after their second season to amend a contract.
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