AZW3 Conversion errs with Calibre 64-bit

[Me_XMan]

Any help is much appreciated.
I'm getting these errs during a conversion from AZW3 to PDF

Spoiler:

calibre, version 4.2.0 (win32, embedded-python: True)
Conversion error: Failed: Convert book 1 of 1 (Exam Ref 70-765 Provisioning SQL Databases)

Convert book 1 of 1 (Exam Ref 70-765 Provisioning SQL Databases)
Conversion options changed from defaults:
output_profile: u'kindle_fire'
cover: u'C:\\Users\\me_xm\\AppData\\Local\\Temp\\calibre_ vhfzgm\\pzdajm.jpeg'
pdf_sans_family: u'MS Shell Dlg 2'
read_metadata_from_opf: u'C:\\Users\\me_xm\\AppData\\Local\\Temp\\calibre_ vhfzgm\\g536fi.opf'
pdf_serif_family: u'MS Shell Dlg 2'
verbose: 2
Resolved conversion options
calibre version: 4.2.0
{'asciiize': False,
'author_sort': None,
'authors': None,
'base_font_size': 0.0,
'book_producer': None,
'change_justification': u'original',
'chapter': u"//*[((name()='h1' or name()='h2') and re:test(., '\\s*((chapter|book|section|part)\\s+)|((prolog|pr ologue|epilogue)(\\s+|$))', 'i')) or @class = 'chapter']",
'chapter_mark': u'pagebreak',
'comments': None,
'cover': u'C:\\Users\\me_xm\\AppData\\Local\\Temp\\calibre_ vhfzgm\\pzdajm.jpeg',
'custom_size': None,
'debug_pipeline': None,
'dehyphenate': True,
'delete_blank_paragraphs': True,
'disable_font_rescaling': False,
'duplicate_links_in_toc': False,
'embed_all_fonts': False,
'embed_font_family': None,
'enable_heuristics': False,
'expand_css': False,
'extra_css': None,
'filter_css': u'',
'fix_indents': True,
'font_size_mapping': None,
'format_scene_breaks': True,
'html_unwrap_factor': 0.4,
'input_encoding': None,
'input_profile': <calibre.customize.profiles.InputProfile object at 0x000001F6F2A36B08>,
'insert_blank_line': False,
'insert_blank_line_size': 0.5,
'insert_metadata': False,
'isbn': None,
'italicize_common_cases': True,
'keep_ligatures': False,
'language': None,
'level1_toc': None,
'level2_toc': None,
'level3_toc': None,
'line_height': 0.0,
'linearize_tables': False,
'margin_bottom': 5.0,
'margin_left': 5.0,
'margin_right': 5.0,
'margin_top': 5.0,
'markup_chapter_headings': True,
'max_toc_links': 50,
'minimum_line_height': 120.0,
'no_chapters_in_toc': False,
'no_inline_navbars': False,
'output_profile': <calibre.customize.profiles.KindleFireOutput object at 0x000001F6F2BA8148>,
'page_breaks_before': u"//*[name()='h1' or name()='h2']",
'paper_size': u'letter',
'pdf_add_toc': False,
'pdf_default_font_size': 20,
'pdf_footer_template': None,
'pdf_header_template': None,
'pdf_hyphenate': False,
'pdf_mark_links': False,
'pdf_mono_family': u'Courier',
'pdf_mono_font_size': 16,
'pdf_page_margin_bottom': 72.0,
'pdf_page_margin_left': 72.0,
'pdf_page_margin_right': 72.0,
'pdf_page_margin_top': 72.0,
'pdf_page_number_map': None,
'pdf_page_numbers': False,
'pdf_sans_family': u'MS Shell Dlg 2',
'pdf_serif_family': u'MS Shell Dlg 2',
'pdf_standard_font': u'serif',
'pdf_use_document_margins': False,
'prefer_metadata_cover': False,
'preserve_cover_aspect_ratio': False,
'pretty_print': False,
'pubdate': None,
'publisher': None,
'rating': None,
'read_metadata_from_opf': u'C:\\Users\\me_xm\\AppData\\Local\\Temp\\calibre_ vhfzgm\\g536fi.opf',
'remove_fake_margins': True,
'remove_first_image': False,
'remove_paragraph_spacing': False,
'remove_paragraph_spacing_indent_size': 1.5,
'renumber_headings': True,
'replace_scene_breaks': u'',
'search_replace': '[]',
'series': None,
'series_index': None,
'smarten_punctuation': False,
'sr1_replace': None,
'sr1_search': None,
'sr2_replace': None,
'sr2_search': None,
'sr3_replace': None,
'sr3_search': None,
'start_reading_at': None,
'subset_embedded_fonts': False,
'tags': None,
'timestamp': None,
'title': None,
'title_sort': None,
'toc_filter': None,
'toc_threshold': 6,
'toc_title': None,
'transform_css_rules': '[]',
'uncompressed_pdf': False,
'unit': u'inch',
'unsmarten_punctuation': False,
'unwrap_lines': True,
'use_auto_toc': False,
'use_profile_size': False,
'verbose': 2}
InputFormatPlugin: MOBI Input running
on C:\Users\me_xm\AppData\Local\Temp\calibre_vhfzgm\2 oob1z.azw3
Found KF8 MOBI of type u'standalone'
P

[Me_XMan]

Viewing file got these errs.

calibre, version 4.2.0
ERROR: Loading book failed: Failed to open the book at C:\Users\me_xm\Calibre Library\Joseph D'Antoni\Exam Ref 70-765 Provisioning SQL Dat (6)\Exam Ref 70-765 Provisioning SQ - Joseph D'Antoni.azw3. Click "Show details" for more info.

Traceback (most recent call last):
File "site-packages\calibre\utils\ipc\simple_worker.py", line 290, in main
File "site-packages\calibre\srv\render_book.py", line 689, in render
File "site-packages\calibre\ebooks\oeb\iterator\book.py", line 64, in extract_book
File "site-packages\calibre\customize\conversion.py", line 246, in __call__
File "site-packages\calibre\ebooks\conversion\plugins\mobi_in put.py", line 47, in convert
File "site-packages\calibre\ebooks\mobi\reader\mobi8.py", line 86, in __call__
File "site-packages\calibre\ebooks\mobi\reader\mobi6.py", line 158, in check_for_drm
DRMError: Exam Ref 70-765 Provisioning SQL Databases

[kovidgoyal]

Your second error indicates the file is DRMed. And what version of windows is this?