However numerous patent disputes, and a blocking attempt by the radio Corporation of America, who thought it would destroy AM radio, halted its advancement.

但是很多对于专利的争议，以及美国的收音机公司对此的阻挠(他们认为调频收音机的发明会毁了调频广播)使之前的进步趋于停滞。

youdao

Sony did file a patent for used-games blocking technology, but apparently that had nothing to do with the Playstation 4.

FORBES: Don't Worry, PS4 Will Play Used Games