Unfortunatly the PLE edition allows full use of Maya but with the added 'bonus' of your renders being typed over.

Unless you have a spare few thousand ($/£) kicking about to get the full version, I'm afraid your stuck.

But being fair to Alias you do get the full version of the software that many many people have put many many many hours into creating that is incredibly powerful. If your just learning then PLE is still very very good.

Thinking about it you could even put thoses renders on your CV/showreel as people will always recognise that 99% of users cant afford the full versions anyway