Is it possible to resize partitions on a write protected internal hard drive?

Hi everyone,
The internal hard drive on my computer has been created into two partitions, one for Mac (350 GB) and another for Windows (150 GB).
Since I rarely use Windows (only for one scientific application from CambridgeSoft), there are a lot of free space on Bootcamp (115 GB). So I would like to resize these partitions to make it the Mac partition maximized, like 450 GB, and 50 GB for Bootcamp.
And the problem is that I'm unable to do that by using Disk Utility, Stellar Management Partition, iPartition.
It says something about write protected (images below).
So are there any ways to undo the write protected or resize those partitions?
Another small question is why the total volume as seen in the second image (iPartition) is not 500 GB, but just 465 GB (50 + 415).
All comments or suggestions are highly appreciated. Thanks!
p.s. I'm the only user.

To resize a Bootcamp partition you must use Bootcamp Assistant to remove the partition then create a new Bootcamp partition, or, use a 3rd party tool such as CampTune.
If you use Disk Utilities you will mess up your hard drive and it will be necessary to erase, format, and reinstall OSx and Windows again. You will lose all your data in OSx and Windows if you try to use Disk Utility to resize a Bootcamp partition.
And, 50 GB is too small for Windows, especially if you install programs and create/use data. 100GB minimum wouls likely work.
Back up all your data before messing with partition changes.

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