iOS DRM Offline download contents Play Error

Discussion
1

After downloading iOS DRm video content, playback works fine immediately after downloading, but after a certain period of time, the video becomes unplayable, resulting in the following error message.

Please help me determine the cause of this issue.

(BitmovinPlayerCore.SourceErrorEvent) 0x0000000144c3d6d0 {
  ObjectiveC.NSObject = {
    isa = BMPSourceErrorEvent
  }
  name = "onSourceError"
  code = .BMPSourceErrorCodeGeneral
  errorCode = 1
  message = "Playback failed. 작업을 완료할 수 없습니다.(BitmovinPlayerCore.FairplayResponse.Failure 오류 1 - The operation couldn’t be completed. (BitmovinPlayerCore.FairplayResponse.Failure error 1.))"
  timestamp = 1765517814.5888751
  data = 0x0000000126473d20 {
    ObjectiveC.NSObject = {
      isa = BMPDeficiencyData
    }
    code = 1
    message = "작업을 완료할 수 없습니다.(BitmovinPlayerCore.FairplayResponse.Failure 오류 1 - The operation couldn’t be completed. (BitmovinPlayerCore.FairplayResponse.Failure error 1.))"
    underlyingError = 0x00000001267e7c90 domain: "BitmovinPlayerCore.FairplayResponse.Failure" - code: 1 {
      _userInfo = 0x0000000144fb43a0 {
        baseNSDictionary@0 ={...}
      }
    }
  }
}