IRVING -- Last week, wide receiver Terry Glenn revealed that the Cowboys were keeping him out of the team's off-season workouts.Now we know why.According to Glenn, the team has asked him to sign a $500,000 injury settlement -- relieving them of any further obligation if he is sidelined for the season due to his surgically repaired right knee.If Glenn was injured without the waiver, the team would be on the hook for his entire 2008 salary of $1.74 millionSo far, Glenn has declined to sign the waiver and has not been allowed to participate in the "organized team activity" workouts the past two weeks.For the Cowboys, its simply a business decision.For Glenn, it's evidence that the Cowboys are not as confident in his recovery and rehab as they say they are."I should have seen this coming," Glenn said via text message.Glenn missed 15 games last season after undergoing two arthroscopic knee surgeries.The Cowboys doctors believe he needs microfracture surgery to fully repair the injury. But because microfracture surgery would require him to miss the entire season and likely end his career, Glenn has opted to strengthen the knee through rehabilitation and weight training.He had no setbacks when he returned to play in the season final last season and in the playoff loss to the Giants.The knee has not given him in any problems during the off-season -- even owner Jerry Jones admits that much.Jones said Glenn has looked very strong during the off-season and very quick during the individual throwing sessions.When it came to Glenn's absence from OTA's, Jones seemingly contradicted himself, giving further insight to the injury settlement dispute.In explaining Glenn's absence last week, Jones said there was no need for him to be there because of his experience and the need to get reps for the younger receivers. He also said he talked to Glenn and predicted he might be working out real soon.On Wednesday, Jones gave the impression that it was Glenn's decision to miss the OTAs."Well this is voluntary, so to each his own," Jones said.