I have never gotten this error before. As you can see from the log, it said it finished without errors. Other than only reaching 4.7x speed (normally gets up to ~12x speed), the process seemed to go perfectly.

I'm wonder what caused this, and whether or not I can trust 100% that the DVD was accurately ripped.

Edit: Forgot to mention that I am running AnyDVD

Here is the DVDdecrypter log:

I 17:50:18 DVD Decrypter Version 3.5.4.0 started!
I 17:50:18 Microsoft Windows XP Professional (5.1, Build 2600 : Service Pack 2)
I 17:50:19 Initialising SPTI...
I 17:50:19 Searching for SCSI / ATAPI devices...
I 17:50:19 Found 1 CD-RW, 1 DVD-ROM and 1 DVD±RW!
W 17:50:19 Possible Structure Protection Found!
W 17:50:19 1 area has been marked as 'suspect'.
W 17:50:19 Dummy sectors will be inserted where necessary.
W 17:56:52 Possible Structure Protection Found!
W 17:56:52 1 area has been marked as 'suspect'.
W 17:56:52 Dummy sectors will be inserted where necessary.
I 17:57:57 Operation Started!
I 17:57:57 Source Device: [3:0:0] PIONEER DVD-RW DVR-109 1.58 (E (ATA)
I 17:57:57 Source Media Type: DVD-ROM
I 17:57:57 Source Media Region Code: 1, 2, 3, 4, 5, 6, 7, 8
I 17:57:57 Source Media Copyright Protection System Type: None
I 17:57:57 Source Media Implementation Identifier: Apple Computer, Inc.
I 17:57:57 Destination Folder: D:\DVDs\RFM_25\
I 17:57:57 File Splitting: By File
I 17:57:57 Remove Structure Protection: Yes
I 17:57:57 Bad Sector Removal Method: Normal
I 17:57:57 Detect Mastering Errors: No
I 17:57:57 Multi Angle Processing: No
I 17:57:57 Remove Macrovision Protection: Yes
I 17:57:57 Stream Processing: No
I 17:57:57 Copying VIDEO_TS.IFO... (LBA: 317 - 325) - KEY: N/A
I 17:57:57 Copying VIDEO_TS.VOB... (LBA: 326 - 382) - KEY: N/A
I 17:57:57 Copying VIDEO_TS.BUP... (LBA: 383 - 391) - KEY: N/A
I 17:57:57 Copying VTS_01_0.IFO... (LBA: 392 - 446) - KEY: N/A
I 17:57:57 Copying VTS_01_0.VOB... (LBA: 447 - 43175) - KEY: N/A
I 17:58:28 Copying VTS_01_1.VOB... (LBA: 43176 - 567377) - KEY: N/A
I 18:03:37 Copying VTS_01_2.VOB... (LBA: 567378 - 1091579) - KEY: N/A
I 18:07:29 Copying VTS_01_3.VOB... (LBA: 1091580 - 1615781) - KEY: N/A
I 18:10:44 Copying VTS_01_4.VOB... (LBA: 1615782 - 2139983) - KEY: N/A
I 18:13:36 Copying VTS_01_5.VOB... (LBA: 2139984 - 2664185) - KEY: N/A
I 18:16:39 Copying VTS_01_6.VOB... (LBA: 2664186 - 3188387) - KEY: N/A
I 18:20:11 Copying VTS_01_7.VOB... (LBA: 3188388 - 3367730) - KEY: N/A
I 18:21:34 Copying VTS_01_0.BUP... (LBA: 3367731 - 3367785) - KEY: N/A
I 18:21:34 Copying VTS_02_0.IFO... (LBA: 3367786 - 3367794) - KEY: N/A
I 18:21:34 Copying VTS_02_0.VOB... (LBA: 3367795 - 3367851) - KEY: N/A
I 18:21:34 Copying VTS_02_1.VOB... (LBA: 3367852 - 3435006) - KEY: N/A
I 18:22:07 Copying VTS_02_0.BUP... (LBA: 3435007 - 3435015) - KEY: N/A
I 18:22:07 Copying VTS_03_0.IFO... (LBA: 3435016 - 3435024) - KEY: N/A
I 18:22:07 Copying VTS_03_0.VOB... (LBA: 3435025 - 3435081) - KEY: N/A
I 18:22:07 Copying VTS_03_1.VOB... (LBA: 3435082 - 3489450) - KEY: N/A
I 18:22:34 Copying VTS_03_0.BUP... (LBA: 3489451 - 3489459) - KEY: N/A
I 18:22:34 Copying VTS_04_0.IFO... (LBA: 3489460 - 3489468) - KEY: N/A
I 18:22:34 Copying VTS_04_0.VOB... (LBA: 3489469 - 3489525) - KEY: N/A
I 18:22:34 Copying VTS_04_1.VOB... (LBA: 3489526 - 3534070) - KEY: N/A
I 18:22:57 Copying VTS_04_0.BUP... (LBA: 3534071 - 3534079) - KEY: N/A
I 18:22:57 Copying VTS_05_0.IFO... (LBA: 3534080 - 3534088) - KEY: N/A
I 18:22:57 Copying VTS_05_0.VOB... (LBA: 3534089 - 3534145) - KEY: N/A
I 18:22:58 Copying VTS_05_1.VOB... (LBA: 3534146 - 3595132) - KEY: N/A
I 18:23:30 Copying VTS_05_0.BUP... (LBA: 3595133 - 3595141) - KEY: N/A
I 18:23:30 Copying VTS_06_0.IFO... (LBA: 3595142 - 3595150) - KEY: N/A
I 18:23:30 Copying VTS_06_0.VOB... (LBA: 3595151 - 3595207) - KEY: N/A
I 18:23:30 Copying VTS_06_1.VOB... (LBA: 3595208 - 3597101) - KEY: N/A
I 18:23:31 Copying VTS_06_0.BUP... (LBA: 3597102 - 3597110) - KEY: N/A
I 18:23:31 Operation Successfully Completed! - Duration: 00:25:34
I 18:23:31 Average Read Rate: 4,689 KB/s (3.4x) - Maximum Read Rate: 6,444 KB/s (4.7x)

if you're using dvd decrypter with anydvd you should disable dvddecrypter's options to "check for structural protection" in the general options and you should enable ElbyCDIO in the I/O options.

Strange though, that I've been running DVDdecrypter and AnyDVD like this for years and never got any warnings or errors with DD.

I've changed the options you suggested. This was just an error caused be DD not being aware of AnyDVD? Is there a reason this particular disc would bring up that warning?

More of the newer movies are coming out loaded with 'bad authoring techniques' which might account for this problem that you are finding.

Ok. My main question though, is can I trust DVDdecrypter when I said that the files were ripped successfully?

I would probably re-rip them. Or you can burn them to a RW disc and see if everything plays ok.

FWIW, I always use DVDD with AnyDVD. (with the settings changed as above). I use it so it will not stop if it hits a bad spot (it keeps hammering away for awhile) and just error out, like explorer does when you just copy files. Also it easy to skip a bad file and get the rest done, then go back and clean the disc and try that error one again.