Cannot convert DRM locked Kindle book

[spctrls]

Calibre 3.41.3 with DeDrm 6.6.3, get Cannot Convert on one book.
Can't find keyfiles for DeDrm.
Ran with debug mode; log file below; any help very appreciated.

Spoiler:

calibre Debug log
calibre 3.41.3 embedded-python: True is64bit: False
Windows-7-6.1.7601-SP1 Windows ('32bit', 'WindowsPE')
32bit process running on 64bit windows
('Windows', '7', '6.1.7601')
Python 2.7.15+
Windows: ('7', '6.1.7601', 'SP1', u'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeDRM (6, 6, 3)
calibre 3.41.3 embedded-python: True is64bit: False
Windows-7-6.1.7601-SP1 Windows ('32bit', 'WindowsPE')
32bit process running on 64bit windows
('Windows', '7', '6.1.7601')
Python 2.7.15+
Windows: ('7', '6.1.7601', 'SP1', u'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeDRM (6, 6, 3)
Turning on automatic hidpi scaling
devicePixelRatio: 1.0
logicalDpi: 96.0 x 96.0
physicalDpi: 72.035450517 x 72.0
Using calibre Qt style: True
[0.00] Starting up...
[0.02] Showing splash screen...
[0.08] splash screen shown
[0.08] Initializing db...
[0.08] db initialized
[0.08] Constructing main UI...
[1.51] main UI initialized...
[1.51] Hiding splash screen
[23.14] splash screen hidden
[23.14] Started up in 23.14 seconds with 7 books
Worker Launch took: 0.136999845505
Job: 0 Convert book 1 of 1 (Losing Military Supremacy: The Myopia of American Strategic Planning) finished
Convert book 1 of 1 (Losing Military Supremacy: The Myopia of American Strategic Planning)
Conversion options changed from defaults:
output_profile: 'kindle_dx'
verbose: 2
cover: u'C:\\Users\\dmk\\AppData\\Local\\Temp\\calibre_cs 9ud2\\1dhvan.jpeg'
read_metadata_from_opf: u'C:\\Users\\dmk\\AppData\\Local\\Temp\\calibre_cs 9ud2\\nsq4m5.opf'
Resolved conversion options
calibre version: 3.41.3
{'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\\dmk\\AppData\\Local\\Temp\\calibre_cs 9ud2\\1dhvan.jpeg',
'debug_pipeline': None,
'dehyphenate': True,
'delete_blank_paragraphs': True,
'disable_font_rescaling': False,
'dont_compress': False,
'duplicate_links_in_toc': False,
'embed_all_fonts': False,
'embed_font_family': None,
'enable_heuristics': False,
'expand_css': False,
'extra_css': None,
'extract_to': 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 0x036888B0>,
'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,
'mobi_file_type': u'old',
'mobi_ignore_margins': False,
'mobi_keep_original_images': False,
'mobi_toc_at_start': False,
'no_chapters_in_toc': False,
'no_inline_navbars': True,
'no_inline_toc': False,
'output_profile': <calibre.customize.profiles.KindleDXOutput object at 0x03688C30>,
'page_breaks_before': u"//*[name()='h1' or name()='h2']",
'personal_doc': u'[PDOC]',
'prefer_author_sort': False,
'prefer_metadata_cover': False,
'pretty_print': False,
'pubdate': None,
'publisher': None,
'rating': None,
'read_metadata_from_opf': u'C:\\Users\\dmk\\AppData\\Local\\Temp\\calibre_cs 9ud2\\nsq4m5.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,
'share_not_sync': False,
'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': '[]',
'unsmarten_punctuation': False,
'unwrap_lines': True,
'use_auto_toc': False,
'verbose': 2}
InputFormatPlugin: MOBI Input running
on C:\Users\dmk\AppData\Local\Temp\calibre_cs9ud2\r5m 1xo.azw
Python function terminated unexpectedly
Losing Military Supremacy: The Myopia of American Strategic Planning (Error Code: 1)
Traceback (most recent call last):
File "site.py", line 101, in main
File "site.py", line 78, in run_entry_point
File "site-packages\calibre\utils\ipc\worker.py", line 200, in main
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 42, in gui_convert_override
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 27, in gui_convert
File "site-packages\calibre\ebooks\conversion\plumber.py", line 1107, in run
File "site-packages\calibre\customize\conversion.py", line 245, in __call__
File "site-packages\calibre\ebooks\conversion\plugins\mobi_in put.py", line 38, in convert
File "site-packages\calibre\ebooks\mobi\reader\mobi6.py", line 162, in extract_content
File "site-packages\calibre\ebooks\mobi\reader\mobi6.py", line 158, in check_for_drm
calibre.ebooks.DRMError: Losing Military Supremacy: The Myopia of American Strategic Planning

[theducks]

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